We suggest a structure for the vacuum comprised of a network of tightly knotted/linked flux tubes formed in a QCD-like cosmological phase transition and show that such a network can drive cosmological inflation. As the network can be topologically stable only in three space dimensions, this scenario provides a dynamical explanation for the existence of exactly three large spatial dimensions in our Universe.
Berera, A., Buniy, R.V., Kephart, T.W. et al. Eur. Phys. J. C (2017) 77: 682. https://doi.org/10.1140/epjc/s10052-017-5253-3
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